Your computer has nothing to do with what you're experiencing. Your engine's design is such that it makes little power at higher RPM. It's designed to make its power in the low to mid RPM range. Compounding the problem of acceleration a speeds above 65mph is that gears 3 and 4 in your transmission are taller which, since gearing multiplies power from the engine to the roadway, means that less power is getting to the roadway once in gears 3 or 4 (with the tradeoff being better fuel economy from turning the engine less RPM). And if you were to somehow get the transmission to kick down to 2nd gear at 65mph (which would turn the engine at 6000+ rpm), that engine makes very little power at high RPM so it wouldn't accelerate well doing that either.

The only ways to "fix" this problem of sluggish acceleration at higher speeds would be to shorten the final drive ratio AND modify the engine in such a way that it makes better power at RPM above ~5000 or to add something like a turbo or supercharger to boost midrange RPM power so that it accelerates harder once it shifts into the stock 3rd or 4th gears.

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Maybe its just a 4 cylinder car not designed to accelerate so quickly. A turbo kit is pretty much useless on that year of that motor.

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Drive in third not D.

1998 Chevrolet Cavalier 2.2l

Reaching third gear, the acceleration slows down immensely. This is caused because the computer was made to put the car in "cruise mode" in 3 gear+ . What can I do specifically so the computer will void this? Any aftermarket parts?

I do not need the description of my cars hp and power. I am aware of this. That is no reason for the change in speed this dramatic. Also no turbo kits for now.

Thanks.